1.下面那些数是方程x^2-x-6=0的根?-4,-3,-2,-1,0,1,2,3,4,.
问题描述:
1.下面那些数是方程x^2-x-6=0的根?-4,-3,-2,-1,0,1,2,3,4,.
1.下面那些数是方程x^2-x-6=0的根?
-4,-3,-2,-1,0,1,2,3,4,.
2.试写出方程x^2-x=0的根,你能写出几个?
答
1、x^2-x-6=(x-3)(x+2)=0,所以x=3或-2
2、x^2-x=x(x-1)=0,所以x=0或1